On our website homepage, and on our customised bottles (for businesses) page, you will see a calculator widget (called 'Calculate your impact') which helps you to estimate how much could you save (financially and sustainably) in a year, buy buying a Dopper bottle.
Here is how we calculate the results:
Calculator for individual customers
| Annual cost savings | (Weekly water intake * SUP Bottle cost per liter * Weeks per year) - (Dopper Bottle cost / Lifespan) - (Weekly water intake * Tap water cost per liter * Weeks per year) = €/year |
| Annual carbon footprint savings | (Weekly water intake * SUP Bottle footprint per bottle * SUP Bottle quantity per liter * Weeks per year) - (Dopper Bottle footprint / Lifespan) = kg CO2e/year |
| Annual plastic savings | (Weekly water intake * SUP Bottle weight per bottle * SUP Bottle quantity per liter * Weeks per year) - (Dopper Bottle weight / Lifespan) = kg/year |
Calculator for business customers
| Annual cost savings | (# of Employees * Working days per year * Daily water intake per employee * SUP Bottle cost per liter) - (# of Employees * Dopper Bottle cost / Lifespan) - (# of Employees * Working days per year * Daily water intake per employee * Tap water cost per liter) |
| Annual carbon footprint savings | (# of Employees * Working days per year * Daily water intake per employee * SUP Bottle quantity per liter * Footprint per SUP Bottle) - (# of Employees * Dopper Bottle footprint / Lifespan) |
| Annual plastic savings | (# of Employees * Working days per year * Daily water intake per employee * SUP Bottle quantity per liter * Weight per SUP Bottle) - (# of Employees * Dopper Bottle weight / Lifefspan) |
References:
- Avoided single-use plastic water bottles, thanks to a Dopper = 104 bottles / year (Dopper Impact Research 2023)
- Dopper bottle lifespan = 5 years (Dopper Impact Research 2023)
- Dopper bottle carbon footprint = 0,14 kg/CO2e per bottle (internal calculation)
- Dopper bottle weight = 0,10 kg
- Dopper bottle price (including VAT) =
- Original (450 ml) - 14,95€
- Insulated (350 ml) - 32,95€
- Insulated (580 m) - 37,95€
- Insulated (1 L) - 44,95€
- Steel (350 ml) - 18,50€
- Steel (490 ml) - 21,95€
- Steel (800 ml) - 29,95€
- Steel (1.1 L) - 32,95€
- Working days per year = 229 (Octagon Professionals)
- Daily consumption of mineral water = 0,85 L/day (RIVM)
- Packaged water cost = 0,66 €/liter (internal calculation based on raw data bought annually from NielsenIQ)
- 0,5 L single-use plastic bottle - Pieces per liter = 2
- 0,5 L single-use plastic bottle - Carbon footprint = 0,07 kg CO2e/pce (internal calculation)
- 0,5 L single-use plastic bottle - Weight = 0,03 kg/pce
- Tap water cost = 0,22 cents/liter (Vewin - Tarievenoverzicht drinkwater 2023)
Note: most references are about the Dutch population (the Netherlands) - not about the worlwide population.
If you have any question about our calculation method and references, please contact us at: info@dopper.com